http://www.architectsjournal.co.uk/Javascript/libraries/Respond/Respond.js
https://www.meed.com/Javascript/libraries/Respond/Respond.js
http://www.hsj.co.uk/Javascript/libraries/Respond/Respond.js
https://www.hsj.co.uk/Javascript/libraries/Respond/Respond.js
http://www.newcivilengineer.com/Javascript/libraries/Respond/Respond.js